Ozone Generator in Pharmaceutical Water Treatment

The OZ India pharmaceutical ozone system generates ozone from high-purity oxygen (99.5%+ O₂, supplied from dedicated oxygen cylinder or PSA generator) at a concentration of 5–10% w/w. This high-purity oxygen feed, combined with corona discharge at precise frequency and voltage, produces pharmaceutical-grade ozone without the nitrogen oxides that air-fed generators can produce. The ozone is injected into the pharmaceutical water distribution loop at a controlled dose of 0.02–0.05 mg/L dissolved ozone — below the 0.1 mg/L level where ozone begins to attack SS316L piping internal surfaces.

At 0.02–0.05 mg/L continuous dissolved ozone, biofilm formation is prevented completely on all wetted surfaces including pumps, valves, heat exchangers, and sampling panels. The mechanism is ozone's oxidation of the extracellular polysaccharide (EPS) matrix that anchors biofilm to surfaces — preventing biofilm attachment before it can form, rather than treating established biofilm. This prevention approach achieves far superior bioburden control compared to periodic hot water sanitisation, which removes established biofilm but cannot prevent rapid regrowth within 3–7 days after sanitisation.

UV disinfection at 254 nm in the pharmaceutical water loop provides a continuous kill mechanism for planktonic (free-floating) bacteria that escape the ozone residual. The OZ India pharmaceutical UV system uses low-pressure amalgam lamps (36–75W) with a design dose of 40 mJ/cm² at maximum loop flow. The 185 nm emission from these lamps additionally performs TOC reduction — photolytically mineralising dissolved organics including endotoxin precursors. The UV system is installed in the distribution loop, typically after the storage tank outlet, before point-of-use drops.

The pharmaceutical water system requires validation per ISPE Guidelines for Water for Pharmaceutical Use. OZ India provides a complete Validation Package with each pharmaceutical UV and ozone system: Design Qualification (DQ) document, Factory Acceptance Test (FAT) protocol, Installation Qualification (IQ) template, Operational Qualification (OQ) template, and Performance Qualification (PQ) methodology. These documents are prepared by OZ India's validation team and reviewed by the client's QA department before commissioning, ensuring CDSCO acceptance and smooth regulatory inspection.

UV intensity monitoring in pharmaceutical UV systems is continuous and data-logged. The UV sensor output is recorded to a 21 CFR Part 11 compliant data logger (Audit trail, user access levels, timestamp), providing complete documentation that the validated UV dose was achieved during every batch of pharmaceutical water production. Ozone residual monitoring in the pharmaceutical loop uses an in-line amperometric dissolved ozone sensor with 4–20 mA output — integrated with the loop control system to maintain the target residual and alarm on deviation.

Deozonation at point of use is essential — ozone in the distribution loop must be removed before the water is used in formulation or equipment cleaning. OZ India includes a UV deozonation unit (254 nm, low dose 60–100 mJ/cm²) at the loop return line, destroying residual ozone to below 0.01 mg/L before storage tank return. This prevents ozone residual accumulation in the storage tank and ensures the distributed water meets the USP purified water specification for organic content. The complete system — ozone injection, distribution loop, UV deozonation — is provided as a validated package.

OZ India Technology pharmaceutical water systems are designed to meet USP <1231>, EP 2.6.12, Indian Pharmacopoeia, and WHO GMP Schedule M requirements. Our pharmaceutical ozone package includes: 316L EP-grade ozone contact vessel, oxygen-fed ozone generator, in-line dissolved ozone sensor, loop injection point with SS316L sanitary fittings, UV deozonation unit at loop return, and complete validation package (DQ/FAT/IQ/OQ/PQ documentation). All wetted components are electropolished 316L SS with Ra <0.4 μm surface finish and comply with ASME BPE standards for bioprocessing equipment.

Our pharmaceutical UV system for TOC reduction and disinfection uses Trojan-UV validated lamp technology with dual-wavelength output: 254 nm (disinfection, 4-log kill at 40 mJ/cm²) and 185 nm (TOC mineralisation to <10 ppb from feed water with TOC <100 ppb). The UV system is sized per loop flow rate and validated by bioassay per DVGW W294. Chamber construction: 316L SS electropolished, EPDM or PTFE O-rings, with quartz sleeves of pharmaceutical optical grade. Available in 100 LPH to 5,000 LPH configurations for pharmaceutical loop return lines.

OZ India's pharmaceutical water project methodology follows ISPE Good Engineering Practice: project phases include URS (User Requirements Specification) review, DQ (Design Qualification), procurement, FAT at OZ India's Greater Noida facility, SAT (Site Acceptance Testing), IQ/OQ/PQ validation at the pharmaceutical plant, and handover to QA. Our validation engineers have conducted pharmaceutical water system validations at pharmaceutical manufacturers in Baddi, Hyderabad, Pune, and Ahmedabad — providing the regulatory validation experience that CDSCO inspectors expect.

Post-installation support for pharmaceutical water systems includes: quarterly TOC and microbial monitoring review, annual UV lamp replacement (included in AMC), dissolved ozone sensor calibration (biannual), and regulatory inspection support documentation. OZ India's pharmaceutical team provides immediate support (phone, WhatsApp, site visit within 24 hours for Maharashtra/UP/Uttarakhand clients) when OOS events occur — providing root cause analysis and corrective action support to minimise production disruption.

Pharmaceutical water system sizing begins with the loop flow rate (m³/hr), which is determined by the total water consumption at all point-of-use locations plus the minimum loop velocity requirement (typically >1 m/sec for all dead legs). The UV system is sized to the loop flow rate at the validated dose of 40 mJ/cm². Ozone injection rate is sized to maintain 0.02–0.05 mg/L dissolved ozone throughout the loop at the maximum loop volume and consumption rate — accounting for ozone decay along the loop length (typically 0.01 mg/L per 100 m at ambient temperature).

For a pharmaceutical facility with 500 LPH point-of-use consumption and 10 m³/hr loop flow, the UV system is sized at 10 m³/hr at 40 mJ/cm² and UVT 99.5% (typical for RO/DI purified water). The ozone generator capacity required: 10 m³/hr × 0.03 mg/L target residual × 1.5 safety factor = 0.45 g/hr — a 1-2g/hr pharmaceutical ozone generator meets this requirement. The UV deozonation unit at loop return must also be sized for 10 m³/hr at 100 mJ/cm² to ensure complete ozone destruction.

Validation planning must begin at sizing stage. OZ India prepares a DQ document that specifies all validated parameters (UV dose, ozone residual range, TOC limit, deozonation effectiveness) before equipment is ordered. This document is reviewed and approved by the pharmaceutical company's QA team and forms the basis for the IQ/OQ/PQ validation at site. Early QA involvement prevents specification changes after procurement that could invalidate the factory test data.